190 MEMOIRS OF THE CARNEGIE MUSEUM. 
while examining the two small buttes, which lie about three hundred yards south 
of Quarry A, Mr. Peterson discovered that in both of them at about the same level 
were extensive outcrops of a stratum containing fossil bones, fragments of which 
were very abundant in the talus. Mr. Peterson called the attention of Mr. James 
H. Cook to these spots and Mr. Cook then stated that he had observed these frag- 
ments some years before, but had mistaken them at the time for the remains of 
““Tndian horses.’”?’ Mr. Peterson, who was not well, was only able to work for 
about a fortnight, and left for his home in Pittsburgh on the 10th of August. 
Mr. Cook was informed by Mr. Peterson prior to his departure that a party 
from the Carnegie Museum would return in the following spring to make syste- 
matic excavations. Mr. Cook, impelled by curiosity, undertook after the with- 
drawal of Mr. Peterson to make some excavations at one of the spots on the western 
side of the larger butte, which had been pointed out to him as rich in remains, 
and was rewarded by finding a number of bones. He reported his discovery 
by letter and was at once earnestly entreated both by Mr. Peterson and the writer 
to desist from further excavations until an experienced collector could assume the 
supervision of the work. This Mr. Cook cheerfully agreed to do. In the spring 
of the year 1905 Mr. Peterson, accompanied by Mr. T. F. Olcott and Dr. Albert 
J. Hermann, returned to the locality and during the open season of that year 
carried on the work of exploration and excavation with remarkable success, being 
joined in the latter part of the season by Mr. W. H. Utterback. Among other 
results of the labors of Mr. Peterson and his assistants in 1905 was the discovery 
of the lower jaw and the cervicals of a large specimen of Moropus. 
In the early summer of this same year Professor Erwin H. Barbour, who in 
the meantime had learned of the discoveries which had been made, repaired to 
the spot and commenced excavating near the place where Mr. Peterson and his 
assistants were at work. His excavations were made in the smaller of the two 
buttes, which he has since named “ University Hill.’”’? He labored for only a brief 
time, but he, too, was rewarded by finding some excellent material, among it 
being fragments of the same genera and species which were found by Mr. Peterson. 
His principal discovery was that of a fragment of the lower part of the cranium of 
Moropus elatus preserving the upper premolar-molar series of teeth on both sides 
and the bones of the palatal and basi-occipital region in place and not distorted by 
crushing. Unfortunately the entire upper and anterior portions of this skull were 
wanting. 
In the spring of the year 1906 Mr. W. H. Utterback, who, as has been stated, 
had assisted Mr. Peterson in the latter part of the season of 1905, was sent to the 
